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Message: <blockquote data-quote="Dave Williams" data-source="post: 1580826" data-attributes="member: 53820">The 300 mm with a 1.4TC = 400 @f4 min  with a 1.7TC= 500@f5.6 min  The 500mm with a 1.4TC= 700 @f5.6min, with a 1.7TC =850 @6.3minI guess you can add the 1.5 crop on top compared to a FX body but theoretically I think I am right in saying you can do that on a computer anyway. Depends on the image quality you are working with. I would guess a D3x image with it's 24 MP's would leave the D300 behind in IQ when the image is cropped by 50% on a computer to even the score. If your subject is too close you might not be able to focus on it ( all lenses differ in minimum focus distance, check out the manufacturerss spec's) , or if it's too big get it all in the frame !The Yellow Wagtail might have been a disaster !I must admit though that too many bird photographers ( me included) have a tendancy to be obsessed with fine detail and consequently size, often at the expense of environment and we end up with birds filling the shot with no sense of proportion at all. Robins so big that if one landed on you would probably kill you !</blockquote>